Synthesis and photovoltaic properties of low band gap quarterthiophenes- alt-diketopyrrolopyrroles polymers having high hole mobility

Seon Kyoung Son, Bong Soo Kim, Chun Young Lee, Joong Suk Lee, Jeong Ho Cho, Min Jae Ko, Doh Kwon Lee, Honggon Kim, Dong Hoon Choi, Kyungkon Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Two low band gap copolymers (PQTDPP and PQTVTDPP) having quaterthiophene (QT) or bithiophene-vinylene-bithiophene (QTVT) as donor unit and diketopyrrolopyrrole (DPP) as acceptor unit have been synthesized via Stille cross-coupling polymerization. The polymers showed high thermal stability and broad light absorption with optical band gaps around 1.3 eV. Cyclic voltammetry measurements revealed that the HOMO and LUMO energy levels of QT and DPP copolymer (PQTDPP) were found to be -5.19 and -3.64 eV, respectively and those of PQTVTDPP -5.05 and -3.66 eV, respectively. X-ray diffraction patterns showed highly crystalline phase in the PQTDPP film and nearly amorphous in the PQTVTDPP film. This dramatic difference in crystallinity was attributed to the structural isomerization around vinyl groups in the PQTVTDPP polymer. Field-effect transistor measurement revealed that the PQTDPP showed high hole mobility of 0.06 cm 2 /Vs and on/off ratio of 10 6 while the PQTVTDPP showed hole mobility of 3.57×10 -4 cm 2 /Vs and on/off ratio of 10 5 , which is consistent with X-ray diffraction results. Photovoltaic devices were also fabricated using polymer:PCBM blends in the structure of ITO/PEDOT:PSS/blend/Al. The PQTDPP devices exhibited an open circuit voltage (V oc ) of 0.58 V, a short circuit current (J sc ) of 7.16 mA/cm 2 , a fill factor (FF) of 0.55 and a power conversion efficiency (PCE) of 2.28%, and the PQTVTDPP devices exhibited an V oc of 0.50 V, a J sc of 7.60 mA/cm 2 , a FF of 0.51 and a PCE of 1.97% under AM 1.5 illumination.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalSolar Energy Materials and Solar Cells
Volume104
DOIs
Publication statusPublished - 2012 Sep 1

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Hole mobility
Conversion efficiency
Polymers
Energy gap
Copolymers
X ray diffraction
Optical band gaps
Open circuit voltage
Polymer blends
Isomerization
Field effect transistors
Short circuit currents
Light absorption
Electron energy levels
Diffraction patterns
Cyclic voltammetry
Thermodynamic stability
Lighting
Polymerization
Crystalline materials

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

Cite this

Son, Seon Kyoung ; Kim, Bong Soo ; Lee, Chun Young ; Lee, Joong Suk ; Cho, Jeong Ho ; Ko, Min Jae ; Lee, Doh Kwon ; Kim, Honggon ; Choi, Dong Hoon ; Kim, Kyungkon. / Synthesis and photovoltaic properties of low band gap quarterthiophenes- alt-diketopyrrolopyrroles polymers having high hole mobility. In: Solar Energy Materials and Solar Cells. 2012 ; Vol. 104. pp. 185-192.
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abstract = "Two low band gap copolymers (PQTDPP and PQTVTDPP) having quaterthiophene (QT) or bithiophene-vinylene-bithiophene (QTVT) as donor unit and diketopyrrolopyrrole (DPP) as acceptor unit have been synthesized via Stille cross-coupling polymerization. The polymers showed high thermal stability and broad light absorption with optical band gaps around 1.3 eV. Cyclic voltammetry measurements revealed that the HOMO and LUMO energy levels of QT and DPP copolymer (PQTDPP) were found to be -5.19 and -3.64 eV, respectively and those of PQTVTDPP -5.05 and -3.66 eV, respectively. X-ray diffraction patterns showed highly crystalline phase in the PQTDPP film and nearly amorphous in the PQTVTDPP film. This dramatic difference in crystallinity was attributed to the structural isomerization around vinyl groups in the PQTVTDPP polymer. Field-effect transistor measurement revealed that the PQTDPP showed high hole mobility of 0.06 cm 2 /Vs and on/off ratio of 10 6 while the PQTVTDPP showed hole mobility of 3.57×10 -4 cm 2 /Vs and on/off ratio of 10 5 , which is consistent with X-ray diffraction results. Photovoltaic devices were also fabricated using polymer:PCBM blends in the structure of ITO/PEDOT:PSS/blend/Al. The PQTDPP devices exhibited an open circuit voltage (V oc ) of 0.58 V, a short circuit current (J sc ) of 7.16 mA/cm 2 , a fill factor (FF) of 0.55 and a power conversion efficiency (PCE) of 2.28{\%}, and the PQTVTDPP devices exhibited an V oc of 0.50 V, a J sc of 7.60 mA/cm 2 , a FF of 0.51 and a PCE of 1.97{\%} under AM 1.5 illumination.",
author = "Son, {Seon Kyoung} and Kim, {Bong Soo} and Lee, {Chun Young} and Lee, {Joong Suk} and Cho, {Jeong Ho} and Ko, {Min Jae} and Lee, {Doh Kwon} and Honggon Kim and Choi, {Dong Hoon} and Kyungkon Kim",
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Synthesis and photovoltaic properties of low band gap quarterthiophenes- alt-diketopyrrolopyrroles polymers having high hole mobility. / Son, Seon Kyoung; Kim, Bong Soo; Lee, Chun Young; Lee, Joong Suk; Cho, Jeong Ho; Ko, Min Jae; Lee, Doh Kwon; Kim, Honggon; Choi, Dong Hoon; Kim, Kyungkon.

In: Solar Energy Materials and Solar Cells, Vol. 104, 01.09.2012, p. 185-192.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis and photovoltaic properties of low band gap quarterthiophenes- alt-diketopyrrolopyrroles polymers having high hole mobility

AU - Son, Seon Kyoung

AU - Kim, Bong Soo

AU - Lee, Chun Young

AU - Lee, Joong Suk

AU - Cho, Jeong Ho

AU - Ko, Min Jae

AU - Lee, Doh Kwon

AU - Kim, Honggon

AU - Choi, Dong Hoon

AU - Kim, Kyungkon

PY - 2012/9/1

Y1 - 2012/9/1

N2 - Two low band gap copolymers (PQTDPP and PQTVTDPP) having quaterthiophene (QT) or bithiophene-vinylene-bithiophene (QTVT) as donor unit and diketopyrrolopyrrole (DPP) as acceptor unit have been synthesized via Stille cross-coupling polymerization. The polymers showed high thermal stability and broad light absorption with optical band gaps around 1.3 eV. Cyclic voltammetry measurements revealed that the HOMO and LUMO energy levels of QT and DPP copolymer (PQTDPP) were found to be -5.19 and -3.64 eV, respectively and those of PQTVTDPP -5.05 and -3.66 eV, respectively. X-ray diffraction patterns showed highly crystalline phase in the PQTDPP film and nearly amorphous in the PQTVTDPP film. This dramatic difference in crystallinity was attributed to the structural isomerization around vinyl groups in the PQTVTDPP polymer. Field-effect transistor measurement revealed that the PQTDPP showed high hole mobility of 0.06 cm 2 /Vs and on/off ratio of 10 6 while the PQTVTDPP showed hole mobility of 3.57×10 -4 cm 2 /Vs and on/off ratio of 10 5 , which is consistent with X-ray diffraction results. Photovoltaic devices were also fabricated using polymer:PCBM blends in the structure of ITO/PEDOT:PSS/blend/Al. The PQTDPP devices exhibited an open circuit voltage (V oc ) of 0.58 V, a short circuit current (J sc ) of 7.16 mA/cm 2 , a fill factor (FF) of 0.55 and a power conversion efficiency (PCE) of 2.28%, and the PQTVTDPP devices exhibited an V oc of 0.50 V, a J sc of 7.60 mA/cm 2 , a FF of 0.51 and a PCE of 1.97% under AM 1.5 illumination.

AB - Two low band gap copolymers (PQTDPP and PQTVTDPP) having quaterthiophene (QT) or bithiophene-vinylene-bithiophene (QTVT) as donor unit and diketopyrrolopyrrole (DPP) as acceptor unit have been synthesized via Stille cross-coupling polymerization. The polymers showed high thermal stability and broad light absorption with optical band gaps around 1.3 eV. Cyclic voltammetry measurements revealed that the HOMO and LUMO energy levels of QT and DPP copolymer (PQTDPP) were found to be -5.19 and -3.64 eV, respectively and those of PQTVTDPP -5.05 and -3.66 eV, respectively. X-ray diffraction patterns showed highly crystalline phase in the PQTDPP film and nearly amorphous in the PQTVTDPP film. This dramatic difference in crystallinity was attributed to the structural isomerization around vinyl groups in the PQTVTDPP polymer. Field-effect transistor measurement revealed that the PQTDPP showed high hole mobility of 0.06 cm 2 /Vs and on/off ratio of 10 6 while the PQTVTDPP showed hole mobility of 3.57×10 -4 cm 2 /Vs and on/off ratio of 10 5 , which is consistent with X-ray diffraction results. Photovoltaic devices were also fabricated using polymer:PCBM blends in the structure of ITO/PEDOT:PSS/blend/Al. The PQTDPP devices exhibited an open circuit voltage (V oc ) of 0.58 V, a short circuit current (J sc ) of 7.16 mA/cm 2 , a fill factor (FF) of 0.55 and a power conversion efficiency (PCE) of 2.28%, and the PQTVTDPP devices exhibited an V oc of 0.50 V, a J sc of 7.60 mA/cm 2 , a FF of 0.51 and a PCE of 1.97% under AM 1.5 illumination.

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